Both of these guys are still themselves

Remaining sand and Papyrus

But I made alt versions of them being humans so I have more human characters for the Mythrilverse

Harlequin becoming Fuze changes almost all of his powers

He is explosion based now, he's got a buncha bombs on his belt

His punches if he so chooses explode on impact

He can create shockwaves

Etc

Ignis only has two real changes

His Katana is now a Dadao and his fighting style is trickster based